\begin{table}[t!b]
\centering\footnotesize
\caption{Overview of initial national vaccination priority allocation ordinances in countries of study (as of December 2020). \label{tab:priority-table}}
\begin{tabular}{lccccc}
\toprule
\textbf{}                 & \textbf{BRA} & \textbf{DEU} & \textbf{ITA} & \textbf{POL} & \textbf{USA} \\
\midrule
Age                       & x            & x            & x            & x            & x            \\
Medical preconditions     & x            & x            & x            & x            & x            \\
Early registration        &              &              &              &              &              \\
Citizenship               &              &              &              &              &              \\
Gender                    &              &              &              &              &              \\
Children                  &              &              &              &              &              \\
Contact with high-risk   &              & x            & x            &              &              \\
\textit{Occupation}                &              &              &              &              &              \\
\hspace{3mm}Healthcare workers        & x            & x            & x            & x            & x            \\
\hspace{3mm}Education                 & x            & x            & x            & x            &              \\
\hspace{3mm}Infrastructure             & x            & x            &              &              &              \\
\hspace{3mm}Social services           & x            & x            & x            & x            & x            \\
\hspace{3mm}State functioning         &              & x            &              &              &              \\
\hspace{3mm}Public order              & x            & x            & x            & x            &              \\
\hspace{3mm}Essential*                &              &              &              &              & x            \\
\hspace{3mm}Non-healthcare frontline* &              &              &              &              & x            \\
Marginalized groups       & x            &             &              &              &            \\\bottomrule
\multicolumn{6}{r}{\scriptsize{\textit{Note:} *This criterion can include various occupations}}\\
\end{tabular}
\end{table}